Script for extracting linux bootable iso into usb drive

bootable.sh

#!/bin/sh

usage ()
{
  echo 'Usage : bootable.sh <path to iso> <device for install like /dev/sdb>'
  echo 'This script install linux bootable iso into first partition of your usb flash drive'
  echo 'You need root privileges for run this script'
  exit 0
}

if [ `id -u` = 0 ]
then
  usage
fi

if [ "$#" -ne 2 ]
then
  usage
fi

mkdir /mnt/iso
mkdir /mnt/flash

echo "Mounting $1 into /mnt/iso"
mount -o loop $1 /mnt/iso

echo "Mounting "$2"1 into /mnt/flash"
mount "$2"1 /mnt/flash

echo "Copying data from iso into flash"
cp -a /mnt/iso/. /mnt/flash

echo "Installing grub into flash"
grub-install --removable --boot-directory=/mnt/flash/boot --efi-directory=/mnt/flash/EFI/BOOT $2

umount /mnt/iso
umount /mnt/flash

echo "Done!"